X-Moto is a challenging 2D motocross platform game, where physics plays an all important role in the gameplay. You need to control your bike to its limits, if you want to have a chance to finish the most difficult challenges. If your system does not have hardware-accelerated OpenGL, you may wish to run the game in "ugly" mode: xmoto --ugly This will increase the framerate significantly, sacrificing the game's eyecandy graphics.
WWW: http://xmoto.tuxfamily.org/